diff options
Diffstat (limited to 'buffer.c')
| -rw-r--r-- | buffer.c | 108 |
1 files changed, 108 insertions, 0 deletions
@@ -137,6 +137,12 @@ static void buffer_validate_cursor(TextBuffer *buffer) { buffer_pos_validate(buffer, &buffer->selection_pos); } +// ensure *line points to a line in buffer. +static inline void buffer_validate_line(TextBuffer *buffer, u32 *line) { + if (*line >= buffer->nlines) + *line = buffer->nlines - 1; +} + // update *pos, given that nchars characters were deleted at del_pos. static void buffer_pos_handle_deleted_chars(BufferPos *pos, BufferPos del_pos, u32 nchars) { if (pos->line != del_pos.line) return; @@ -2555,6 +2561,9 @@ void buffer_indent_lines(TextBuffer *buffer, u32 first_line, u32 last_line) { void buffer_dedent_lines(TextBuffer *buffer, u32 first_line, u32 last_line) { assert(first_line <= last_line); + buffer_validate_line(buffer, &first_line); + buffer_validate_line(buffer, &last_line); + buffer_start_edit_chain(buffer); Settings const *settings = buffer_settings(buffer); u8 const tab_width = settings->tab_width; @@ -2583,6 +2592,7 @@ void buffer_dedent_lines(TextBuffer *buffer, u32 first_line, u32 last_line) { buffer_end_edit_chain(buffer); } + void buffer_indent_selection(TextBuffer *buffer) { if (!buffer->selection) return; u32 l1 = buffer->cursor_pos.line; @@ -2608,3 +2618,101 @@ void buffer_dedent_cursor_line(TextBuffer *buffer) { buffer_dedent_lines(buffer, line, line); } + +void buffer_comment_lines(TextBuffer *buffer, u32 first_line, u32 last_line) { + Language lang = buffer_language(buffer); + const char *start = language_comment_start(lang), *end = language_comment_end(lang); + String32 start32 = str32_from_utf8(start), end32 = str32_from_utf8(end); + + buffer_start_edit_chain(buffer); + + for (u32 line_idx = first_line; line_idx <= last_line; ++line_idx) { + // insert comment start + if (start32.len) { + BufferPos sol = buffer_pos_start_of_line(buffer, line_idx); + buffer_insert_text_at_pos(buffer, sol, start32); + } + // insert comment end + if (end32.len) { + BufferPos eol = buffer_pos_end_of_line(buffer, line_idx); + buffer_insert_text_at_pos(buffer, eol, end32); + } + } + + str32_free(&start32); + str32_free(&end32); + + buffer_end_edit_chain(buffer); +} + +static bool buffer_line_starts_with_ascii(TextBuffer *buffer, u32 line_idx, char const *prefix) { + buffer_validate_line(buffer, &line_idx); + Line *line = &buffer->lines[line_idx]; + size_t prefix_len = strlen(prefix); + if (line->len < prefix_len) + return false; + for (size_t i = 0; i < prefix_len; ++i) { + assert(prefix[i] > 0 && prefix[i] <= 127); // check if actually ASCII + if ((char32_t)prefix[i] != line->str[i]) + return false; + } + return true; +} +static bool buffer_line_ends_with_ascii(TextBuffer *buffer, u32 line_idx, char const *suffix) { + buffer_validate_line(buffer, &line_idx); + Line *line = &buffer->lines[line_idx]; + size_t suffix_len = strlen(suffix), line_len = line->len; + if (line_len < suffix_len) + return false; + for (size_t i = 0; i < suffix_len; ++i) { + assert(suffix[i] > 0 && suffix[i] <= 127); // check if actually ASCII + if ((char32_t)suffix[i] != line->str[line_len-suffix_len+i]) + return false; + } + return true; +} + +void buffer_uncomment_lines(TextBuffer *buffer, u32 first_line, u32 last_line) { + Language lang = buffer_language(buffer); + const char *start = language_comment_start(lang), *end = language_comment_end(lang); + u32 start_len = (u32)strlen(start), end_len = (u32)strlen(end); + buffer_start_edit_chain(buffer); + for (u32 line_idx = first_line; line_idx <= last_line; ++line_idx) { + // make sure line is actually commented + if (buffer_line_starts_with_ascii(buffer, line_idx, start) + && buffer_line_ends_with_ascii(buffer, line_idx, end)) { + // we should do the end first, because start and end might be overlapping, + // and it would cause an underflow if we deleted the start first. + BufferPos end_pos = buffer_pos_end_of_line(buffer, line_idx); + end_pos.index -= end_len; + buffer_delete_chars_at_pos(buffer, end_pos, end_len); + + BufferPos start_pos = buffer_pos_start_of_line(buffer, line_idx); + buffer_delete_chars_at_pos(buffer, start_pos, start_len); + } + } + buffer_end_edit_chain(buffer); +} + +void buffer_toggle_comment_lines(TextBuffer *buffer, u32 first_line, u32 last_line) { + Language lang = buffer_language(buffer); + const char *start = language_comment_start(lang), *end = language_comment_end(lang); + // if first line is a comment, uncomment lines, otherwise, comment lines + if (buffer_line_starts_with_ascii(buffer, first_line, start) + && buffer_line_ends_with_ascii(buffer, first_line, end)) + buffer_uncomment_lines(buffer, first_line, last_line); + else + buffer_comment_lines(buffer, first_line, last_line); +} + +void buffer_toggle_comment_selection(TextBuffer *buffer) { + u32 l1, l2; + if (buffer->selection) { + l1 = buffer->cursor_pos.line; + l2 = buffer->selection_pos.line; + sort2_u32(&l1, &l2); // ensure l1 <= l2 + } else { + l1 = l2 = buffer->cursor_pos.line; + } + buffer_toggle_comment_lines(buffer, l1, l2); +} |